@Aedes,
Aedes wrote:How can we know the motives, though? Mozart was just as concerned with money as a modern composer who writes jingles for TV commercials.
I'm sorry didn't you just contradict yourself?
You asked how can we know the motives, and then told me what Mozart's motives were. Apparently you do know the motives, at least in this instance, so perhaps you could tell us how you know the motives.
Regarding my statement, you should have left in the disclaimer sentence one before the quote. Yes making money is a motive, or in many cases one can not make the art. The piano Mozart played was payed for with money most likely, as is most people's instruments, practice spaces, and studio time, but as I said there is a line that gets crossed. The more it's about money that is not just there to sustain the artist and the art, generally, but not absolutely it is less art and more commerce. The inverse is also true. It is not one or the other, it is a matter of degree.
How can we know intentions? We can't 100%, but the more experienced, the more intuitive you become. Just like the more times you have seen someone chatting someone up, the better your guess at whether they are in it for the person, or just the sex. Whether a woman is interested in you, or your money, becomes apparent in time.